The Son Doong Cave expedition is considered difficult and you must be physically active with regular trekking experience.
Mark the letter A, B, C or D on your answer sheet to indicate the word or phrase that is OPPOSITE in meaning to the underlined part in each of the following questions.
The Son Doong Cave expedition is considered difficult and you must be physically active with regular trekking experience.
A. beautiful
B. strong
C. passive
D. boring